Throttle valve



Aug. 22, 1933. 1 DE MQOY 1,923,919

THROTTLE VALVE Filed Nov.` 27. 1951 2a f5@ 262027 ne 2 27 l Z5 Z/ .\5/\50 Z@ Z 2/ 7 ,ZZ

24' @wif J 27 v 2i 5/ 50 ,Z Z0 X72/ /7 ZZ fm/v of Moby NVENTOR ATTORN EY Y Patented Aug. 22, 1933 1 stares erica THRo'r'rLE vALvE i .lohn De Moby, Cleveland, Ohio, assigner to The lCleveland ifneumatic Tool Company, Cleveland, Ohio, a Corporation of Ohio Application November 27, 1931' Serial No. 577,465

Claims. (C1. 251-78) This invention'relates broadly to a throttle valve but is more 'particularly concerned with a throttle valve of the gasket type construction.

, .5. One object of this invention isto provide a throttle valve with efficient packing means operated by the action of pressure fluid, aiiording thereby a fluid tight joint, the sealing capacity of whichis proportional to the intensity 1G of the pressure fluid thus producing a throttle valve adaptable to any pressure.

Another object of thisA invention, is v,to produce a throttle valve easy of operation and simple oi manufacture thus reducing to a minimum 15 the cost of fabrication and maintenance.

In the drawing which illustrates a preferred embodiment of the invention. ,Y

Fig. 1 is a longitudinal View partly in section of the throttle valve illustrated in a closed position. v

Fig. 2 is a view similar to Fig. 1 but illustrating the throttle valve in an opened position.Y

Fig. 3 is a longitudinal view partly'in section r of a throttle valve illustrating a modification of the invention. i

Referring to the drawing in which like symbols designate corresponding parts throughout the several views, 10 is the valve casing provided with a screw threaded bore 11 capable of receiving a screw threaded pressure fluid connec tion 12. Intermediate the ends of the casing 10 and in axial alignment with the bore 11, there is a cylindrical chamber 13 opening into the bore V 11 through a restricted bore 1li. This'chamber chamber 13 and terminated by two oppositely disposed counterbores 19 and 20.

Slidably mounted within the casing 10 and cap 17 there is a throttle valve formed of a cylindri cal stem 21 engageable within the bore 18 and '5 the scope and spirit Vof 'theinvention Y' is connected to the end of the casing 10 by anl a restricted bore 18 in axial alignment with the` an enlarged portion 22 engageable within the counterbore 19, and having one of the ends of said enlarged portion constituting an annular shoulder 23 capable of engagement with 'the bottom of thecounterbore 19 for limiting the left- 60 ward movement of the throttle valve. The other i end of said enlarged portion is provided with an enlargedcircular flange 24 formed with an integral projecting nozZle-like member 25. inter-- mediateits ends the stein 21 is provided with a 65 plurality of transversely disposed orifices 26 leading toA atmosphere throughfthe nozzle-like member 25 byv a longitudinally disposed port 27.

.Toward its end, the stem 21 is manufactured with a' restricted portion forming an annular recess 70 or groove 28 the purpose of which will be eX- plained later.4 The outward movement of the throttle valve is limited by the engagement of a spring ring member 29 with the bottom of the counterbore 20, said ring being snugly and cir- 75.

cumferentially disposed upon the stem 21. Disposed upon the shoulder 16 and capable of iiuid tight engagement with the stern 21, there is a packing ring 30 preferably made of leather and having an inwardly projecting lip 31. The packingis maintained upon the shoulder 16 by the engagement of a steel washer 32 forcibly secured thereagainst by the outer end of the screw threaded cap '18. y

In the operation of the throttle valve, assum- Ving the pressure fluid is admitted into the casing 10 through the fluid connection 12 and the throttle valve being positioned as illustrated in Fig. 1, pressure fluid is admittedinto the chamber 13 by flowing between the end portion of the stem 21 and therightward edge of thebore 14. From the chamber 13 pressure uid acts upon the packing inwardly projecting'lip SL-tendingto force it in the other direction or toward the right and consequently forcibly engaging same against the stem 21V thus preventing any escape of pressure fluid from the chamber 13 into the orifice 26 and port 27 to atmosphere.

. The throttle valve may be moved from a closed to an opened position by applying a sufiicient pressure upon the flange 24 to overcome the pressure exerted bythe pressure fluid upon the Ion ward end of the stem 21. During that operation, the forward end portion of the stem 21V is rst engaged with the wall of the bore 14 thus precluding` theadmission of pressure fluid into the chamber 13 and consequently reducing the pressure applied upon the packing lip 31. Immediately thereaftervthe orifice 26 will travel under the lip 31 to be admitted into the chamberk 13 and somewhat previous to the disengagement of the forward end portion of the stein 21 from the wall of the bore 14. rWhen the stem 21 reaches the extreme of its travel, i. e. when the shoulder 23 is engaged with the bottom of the counter'- bore 19, the recess 28 will be positioned within the bore 14 (see Fig. 2) thus allowing the pressure fluid to flow from the bore 11, through the bore l-i into the chamber 13 and finally through the plurality of orifices 26 and port 27 to atmosphere. It will be noticed that in the open position pressure fiuid is also exerting pressure upon the lip 31 of the gasket 30 to prevent leakage oi' the pressure fluid around the stem 21.

When the pressure applied on the flange 2e is removed therefrom, the pressure exerted on the forward end of the stem 21 cy the pressure fluid will` return the same to its normal or valve closed position as illustrated in Fig. 1. During this operation the forward end portion of the stern 2l will nrst engage the wall of the bore 1li, thus precluding the admission of pressure fluid into the chamber 13. immediately thereafter, the orifices 26 are still in communication with the chamber 13, thus permitting the pressure fluid remaining in that chamber to exhaust tothe atmosphere through the orifices 26 and port 27, and consequently preventing any pressure to be exerted upon the lip 31 during tnepassage of the orifices 26 thereunder. 1t is evident that if such Vpressure was allowed to act upon thelip 31, said lip would have the tendency to be forced into the plurality of orifices and consequently causeda deleterious effect of the gaslse't'l. After the passage of the orifices 25 into the counterhore 2), the forward end of the stein 21 will again be out of engagement with the wall Cil of the bore 1li and consequentlywill allow pressure fluid to he admitted intothe chamber i3,

as described previously and illustrated in Fig. 1. Y

in the modification of the invention illustrated in Fig. 3, the forward end of the stern 2l and the bore 14 are made longer and are manufactured to afford a convenient clearance between them thus when the valve is moved from the open to the close position, a restricted amount of pressure fluid will be admitted through said clearance into the chamber 13 to exert a suiiicient pressure upon the gasket lip 31 for preventing the escape of pressure fluid around the stem 21. The pressure however will not be sufficient tol force the gasket lip into the orifices 26 and cause pernicious eifect thereto.

Although the foregoing description is necessarily of a detailed character, in order to completely set forth the invention, it is to be understood that the specific terminology is not intended to be restrictive or confining and it is to he further understood that various rearrangements of parts and modifications of structural detail may be resorted Vto without departing from the scope or spirit of the invention as herein claimed.

I claim:

l. In a throttle valve, a casing and a stem reciprocable therein means for admitting pressure fluid within said casing, a washer gasket within said casing having an inwardly projecting lip subjected to the action of pressure iluid for forciblyV engaging said stern in fluid tight relation therewith, orifices within said stem capable of communication with said pressure fluid when the stein is in one position to allow the flow thereof from said casing to atmosphere, and means at the forward end of said stem and engageabie with said casing for preventing said fluid to act upon said lip during the passage of said orifices under said lipV and disengageable from the casing to permit the pressure iiuid to act upon the lip after the oriices have been moved out of communication with said fluid.

2. In athrottle valve, a casing and a stem reciprocable therein, means for admitting pressure fluid within said casing, a gasket within said Acasing having an inwardly projecting lip subjected to the action of pressurelluid for forcibly engaging said stem in fluid tight relation therewith, iuid conveyingmeans within said stem capable of communication with said fluid when the stem is in one position, and further means on said stem engageabie with said casing for throttling the admission of said pressure fluid upon said lip during the passage of the inlet end of said conveying means under said lip.

S. In a throttle valve, a casing and a stem reciprocahle therein, means for admitting pressure fluid within said casing, a gasket within said casing subjected to the pressure iluid for forcibly engaging said stem in fluid tight relation therewith, pressure iiuid conveying means withinsaid stern having an inletk end movable into Vor out of communication with said pressure duid, and further means on said stein engageaole with said casing for throttling the admission of said pressure fluid upon said gasket when said inlet end of said conveying means is moved out of communication withlthe pressure iiuid in said casinv. l i

il. In a throttle valve, a casing and a stemreciprocable therein, means for admitting pressure fluid within said casing, a gasket within said casing subjected to the pressure of'said fluid for forcibly engaging said gasket in fluid tight relation with said fluid conveying means within said stern movahleinto or out of communication withv said fluid, and further means for preventing said pressure fluid to act upon said gasket during the passing of the inlet end of said iiuid conveying means hy said gasket `when moved out of communication with said fluid and for allowing said pressureuid to act upon said gasket at each extreme end of the travel of said stem.

5. In a throttle valve, a casing and a stern reciprocahle therein, nieansifor admitting motivek fluid within said casing, a gasket within said casing capable of fluid Vtight engagement with said stem, pressure fluid conveying means within said stern movable into Vor out of communication with said fluid, means for allowing said pressure fluid to act upon said gasket for causing the fluid tight engagement of the latter with said stem at each extreme end of the travel thereof, and for preventing said pressure fluid to act upon said gasket during the reciprocation of said stem, said means comprising a portion of said stem engageable with said casing during the intermediate reciprocation of the formerl within the latter.

6. In a throttle valve7 a casing and a stern reciprocahle therein, for admitting pressure fluid within said casing, a pressure nuid operable gasket capable of fiuid tight engagement with said stern, fluid conveying means within said stem movableinto or out of communication' with said uid, means for allowing said pressure iiuid to operate upon said gasket at each extreme end of the travel of said stem and for preventing saidroperation during the movement of said fluid conveying means out of communication with said fluid. Y Y

7. In a throttle valve, a casing having means for admitting pressure fluid therein, a'stem ,con-

stituting a valve reciprocable Within said casing and having pressure fluid conveying means therein maintained out of communication with said pressure iiuid at one extreme end of the travel of said stem and capable of communicationwith said pressure uid at the other extreme end of the travel of said stem, fiuid pressure surface of said stem subjected to the action of said pressure uid to normally maintain said stem in one extreme end of its travel, pressure iiuid actuated means capable of iiuid tightL engagement with said stem at each extreme end of the travel of said stem and further means for preventing the pressure fluid actuation of said means during the movement of said fluid conveying means into or out of communication with saidpressure fluid.

8. In a throttle valve, a casing having means for admitting pressure uid therein, a Valve re-l gasket during the reciprocation of said valve from open position. y

9` A valve comprising a stationary member and a second member movable in respect to said first mentioned member, means for admitting pressure fluid within one of said members, a fluid passageway within the other of said members movable into or out of communication with saidpressure fluid, a gasket subjected to the action of pressure uid for forcibly engaging said movable member in fluid tight relation therewith and means for throttling the admissions of said pressure uid upon said gasket during the movement of said passageway out of communication with said pressure fluid.

10. A valve comprising a'stationary member and a member reciprocable in respect thereto, means for admitting pressure uid within one of said members, fiuid passage controlling means within the other of said members, a gasket subjected to the action of pressure fluid for forcibly engaging said reciprocable member in fluid tight relation therewith, and meansaffecting the action of said fluid upon said gasket during the passing of said uid passage controlling means, said action being affected by controlling the admission of said pressure iuid upon said gasket.

11. A valve comprising two members movable in respect to each other, one of said members having a chamber into whichpressure fluid may be admitted, the other of said members having means movable into or out of communication with said chamber for controlling the outlet of pressure fluid from said chamber, a gasket engageable with said members and subjected to the action of pressure fluid to yaiiford a fluid tight joint between said members during the communication of said means with said chamber and further means throttling the admission of the pressure fluid upon said gasket during the movement of the firstl mentioned means out of communication with said chamber.

pressure fluid from said stationary member, a-

gasket engageable with said members subjected to the action of pressure fiuid to afford a .fluid tight joint between said members during the flow of exhausting pressure fluid from said stationary member and means for. preventing the admission of the pressure uid upon said gasket during the movement of the second member from open position. Y Y

13. A valve comprising a stationary ymember capable of admitting pressure uid therein, a second member movable in respect to said stationary member into a valve `Closed or valve opened position for controlling the outlet of said pressure fluid from said stationary member, a gasket engageable with said members subjected to the action of pressure fluid to afford a fiuid tight joint between said members during the flow of exhausting pressure iiuid from said stationary member and means for simultaneously preventing the'flow of exhausting pressure fluid from said stationary member and preventing the admission of the pressure fluid upon said gasket during the movement of the second member from open position.

14. A valve comprising a stationary member and a member reciprocable in respect thereto, means for admitting pressure fluid within one of said members, a gasket engageable with each of said members subjected to the pressure of said uid to aiord a uid tight joint between said members, fluid conveying means within one of said members movable into or out of communication with said uid, means for preventing said pressure fiuid to act upon said gasket during the passing of the inlet end of said iiuid conveying means by said gasket when moved out of communication with said fluid and for allowing said pressure fluid to act upon said gasket at each extreme end of the travel of said reciprocable member.

15. A valve comprising a stationary member having a chamber withinwhich pressure fluid may be admitted, a second member movable in respect to said stationary member into a valve closed or valve opened positionfor controlling the iiow of said pressure uid within said chamber, a gasket engageable with-,each of the members and subjected to the action of said pressure iiuid for forcibly maintaining a fluid tight joint between said members when said second member is in a closed or opened position, and further means for checking during the movement of said second member from one position to another the pressure fluid to act upon said gasket.

J OHN DE MOOY. 

